Real Dictionary

midlife crisis
A midlife crisis is a period of doubt and anxiety that some people experience in middle age, when they think about whether their life is the kind of life that they want.

midlife crisis in American English
noun: a period of psychological stress occurring in middle age, thought to be triggered by a physical, occupational, or domestic event, as menopause, diminution of physical prowess, job loss, or departure of children from the home

midlife crisis in British English
noun: a crisis that may be experienced in middle age involving frustration, panic, and feelings of pointlessness, sometimes resulting in radical and often ill-advised changes of lifestyle